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Circuits
Overachieving and under-appreciated, circuits are the foundation that our technological society is built on. Now's your chance to find out not only how they work, but why. Questions regarding the physics behind voltage, resistance, capacitance, inductance, transistors, LEDs, switches, and power supplies; and how they're used to create analog and digital circuits, should be directed here.
1,646 Questions
Power = (voltage) x (current) = (120) x (0.042) = 5.04 watts
Can you obtain OR gate function from AND gate?
Well, if you mean to make the truths of an AND gate similiar to the ones of OR gates, then you can do the following:
1. Put an inverter at every input of the AND gate. This will make it act like an NOR gate
2. Put an inverter at the output of the gate. This will invert the truths and turn the NOR gate into an OR gate
What is working principle of rheostat in electric circuits?
The basic principle that rheostats use is Ohm's law, which states that current is inversely proportional to resistance for a given voltage. This means the current decreases as the resistance increases or it increases as the resistance decreases. Current enters the rheostat through one of its terminals, flows through the wire coil and contact, and exits through the other terminal. Rheostats do not have polarity and operate the same when the terminals are reversed. Three-terminal potentiometers can be used as rheostats by connecting the unused third terminal to the contact terminal.
What kind of aluminum wire has the most resistance?
The one with the smallest thickness (highest AWG number)
and longest length has.
Will the fuse blow as shown in the link in this equipment?
The Related Link shows a transformer inside a metal cabinet, supplied with 120VAC protected by a fuse and the standard neutral connection back to the supply. There is a ground connection from the supply to ground, but there is no ground connection shown for the metal cabinet.
The question asks, if the (fused) hot side of the transformer shorts to the metal cabinet, will the fuse blow?
The answer depends on whether or not the metal cabinet is grounded.
If it is not grounded, as implied in the diagram, then the fuse will not blow, because there is no circuit formed to do so. Additionally, AND MORE CRITICALLY, this would energize the metal cabinet, creating an electrocution hazard.
However, it must be noted that per the NEC (US) and most probably any other country's electrical code, such a metal cabinet MUST be grounded.
IF, AND ONLY IF, the metal cabinet is grounded, then the fuse will blow, due to the additional fact that neutral and ground are connected together at the distribution panel (again, by code), and again, at the service entrance, and this will form a high current circuit sufficient to blow the fuse and prevent an electrocution hazard.
FYI - If I encountered such an ungrounded condition in a metal cabinet, I would do everything in my power to cause the installing electrician to lose his or her license. Additionally, if this caused an electrocution (whether fatal or not) I would sue said electrician for everything they were worth, and I would probably win, even though that would not bring back the person that died. This type of malfeasance should not and cannot be tolerated.
What is watts for a instrument that operates 230V at 50Hz with 130VA?
Seeing that "130VA" on the label, you should assume that there should be
130 watts of mains power available to operate the instrument.
When you are creating a generator what determines how much current is generated?
You don't generate current. You generate voltage, and the amount of current that
leaves the generator is determined by the devices that are designed to run with
that voltage, and draw their operating energy from your generator.
You choose the size of the materials used to construct your generator based on the
maximum amount of current you expect it to be asked to deliver by its users. But
the actual current at any moment will depend on how many people are using it for
their supply, and what kind of appliances they're operating.
If nobody is using power from your generator, or the output cables are disconnected
from it, then you can run it all you want and the current will be zero.
Before you decide on the final design and go out for bids to construct your generating
station, you might like to review the topics of voltage, current, power, and energy, and
get them straight in your mind.
RS-232 is a standard for the voltage levels that represent the logic values in a
digital communications circuit. It does nothing for you, until you feel you might
like to communicate digitally with somebody else. At that point, it becomes
very helpful for both of you to operate in accordance with the same standard.
Otherwise, you may transmit all you want to but you'll never receive amnything.
What type of circuit is used in a pinball machine?
you would use a parallel circut beacuse it will give it more power
If AC, use a transformer. If DC, use a voltage regulator (lossy), or Pulse-Width Modulation (PWM; complicated) to limit the voltage/current.
Why the limiting resistors are need in 7-segment display?
Each light-emitting segment is nothing but an LED, which is electrically similar to
any other diode. Once the forward voltage exceeds something around 1.7 volts,
the resistance of the diode becomes very verysmall. At any higher voltage, it
would literally appear as a "short" circuit, without a separate series limiting resistor.
Can you have a current of 0.05 amperes?
Yes. Most typical discrete transistors work with base currents around 10mA (0.010A).
What is the measure of electrical energy an electron carries?
The charge on an electron can be measured as -1e, or -1.602 176 487(40) * 10^-19 Coulombs.
Energy of an electron is usually measured in electron Volts (eV). This dimensionally is the same as Joules (energy). The unit Volt is Joules per Coulomb (energy/charge).
Yes, but only if its output is logically inverted (a AND gate's behavior is a direct opposite of a NAND gate's behavior, logically).
What effect does the bypass capacitor have on the output impedance of the amplifier?
The quantity of specific information included in the question is exceeded only by
the quantity of vital, relevant information that's never mentioned.
Are you talking vacuum-tube or transistor amplifier ? What's the configuration of the
amplifier, i.e., which terminal of the active device is 'common' to input and output ?
And where is the bypass capacitor in the circuit ?
I'll take a wild stab and assume that you have a common-emitter amplifier, with the
capacitor bypassing the bias resistor in the emitter branch. If that's the case, then
the resistor is supposed to be there only to set the DC Q-point, but every effect it
could have on small-signal performance would be an effect that you don't want ...
it would increase the output impedance, and any impedance common to input and
output always reduces the gain.
So one of the effects of the bypass capacitor is to reduce the output impedance
of the stage.
(If Dingobot comes along now and flags this for gibberish, that'll be my first clue
that after all these years, I don't actually remember this stuff too well.)
What are the applications of single tuned coupled circuits?
The resonance effect of the LC circuit has many important applications in signal processing and communications systems.
- The most common application of tank circuits is tuning radio transmitters and receivers. For example, when we tune a radio to a particular station, the LC circuits are set at resonance for that particular carrier frequency.
- A series resonant circuit provides voltage magnification.
- A parallel resonant circuit provides current magnification.
- A parallel resonant circuit can be used as load impedance in output circuits of RF amplifiers. Due to high impedance, the gain of amplifier is maximum at resonant frequency.
- Both parallel and series resonant circuits are used in induction heating.
LC circuits behave as electronic resonators, which are a key component in many applications:
What is the polarity of fixed capacitor?
Most fixed capacitors, and almost all variable ones, have no polarity. That is, it
makes no difference to the capacitor which side you make positive and which side
you make negative, and your choice has no impact on the performance or lifetime
of the capacitor.
Electrolytic capacitors and some tantalum ones do have a preference, and the
polarity of their two leads is marked on the component. Their dielectric is formed
by an internal electro-chemical process that depends on the polarity, such that
the dielectric goes away if the polarity is reversed, and then you no longer have
a capacitor.
What is the carrier voltage of modulated signal?
The 'carrier' is the signal that's flowing from the antenna into your receiver
when there's no talk, no music, no sound of any kind on the signal. That's
when you hear nothing out of the radio, because the radio is built to catch
and work with only the changes of the carrier ... the modulation.
